Mid-infrared supercontinuum generation in As_2S_3-silica “nano-spike” step-index waveguide
Efficient generation of a broad-band mid-infrared supercontinuum spectrum is reported in an arsenic trisulphide waveguide embedded in silica. A chalcogenide "nano-spike", designed to transform the incident light adiabatically into the fundamental mode of a 2-mm-long uniform section 1 μm in...
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Veröffentlicht in: | Optics express 2013-05, Vol.21 (9), p.10969 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | Efficient generation of a broad-band mid-infrared supercontinuum spectrum is reported in an arsenic trisulphide waveguide embedded in silica. A chalcogenide "nano-spike", designed to transform the incident light adiabatically into the fundamental mode of a 2-mm-long uniform section 1 μm in diameter, is used to achieve high launch efficiencies. The nano-spike is fully encapsulated in a fused silica cladding, protecting it from the environment. Nano-spikes provide a convenient means of launching light into sub-wavelength scale waveguides. Ultrashort (65 fs, repetition rate 100 MHz) pulses at wavelength 2 μm, delivered from a Tm-doped fiber laser, are launched with an efficiency ~12% into the subwavelength chalcogenide waveguide. Soliton fission and dispersive wave generation along the uniform section result in spectral broadening out to almost 4 μm for launched energies of only 18 pJ. The spectrum generated will have immediate uses in metrology and infrared spectroscopy. |
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ISSN: | 1094-4087 1094-4087 |
DOI: | 10.1364/OE.21.010969 |